7.4.1. Junctions of BJT

Try these first

1. 1.

   What are the three main components of a BJT?

   Hint

   Think about the basic structure of the transistor.

2. 2.

   What happens to the base-emitter junction under normal operating conditions?

   Hint

   Consider the direction of voltage applied.

3. 3.

   What type of bias occurs at the base-emitter junction during normal operation?

   • Forward Bias
   • Reverse Bias
   • Zero Bias

   Hint

   Consider the necessary conditions for current flow.

4. 4.

   Is the collector junction typically forward biased during normal operation?

   • True
   • False

   Hint

   Think about the controlling conditions in the BJT circuit.

5. 5.

   Given a certain base current, calculate the expected collector current using the BJT current gain (β). If the base current is 20 µA and β is 100, what is the collector current?

   Hint

   Recall the collector current calculation formula based on the base current and transistor gain.

6. 6.

   A BJT is connected in a circuit where the base-emitter voltage is 0.7V. Determine if this is in forward or reverse bias and justify your answer.

   Hint

   Consider the typical threshold voltage for silicon-based BJTs.